6 papers
QBism on Locality and Nonlocality
John B. DeBrota, Christopher A. Fuchs, Rüdiger Schack
Recently Pienaar (2026), building on work of Cavalcanti (2021), has shown that QBism cannot always assume distinct observers' quantum-measurement outcomes---say, of Wigner and his…
Robust Negativity in the Quantum-to-Classical Transition of Kerr Dynamics
Mohsin Raza, John B. DeBrota, Ariel Shlosberg +2
We quantify the quantum-to-classical transition of the single-mode Kerr nonlinear dynamics in the presence of loss. We establish three time scales that govern the dynamics, each wi…
Bayesian rational agents in iterated quantum games
John B. DeBrota, Peter J. Love
We apply a Bayesian agent-based framework inspired by QBism to iterations of two quantum games, the CHSH game and the quantum prisoners' dilemma. In each two-player game, players h…
Consciousness, Quantum Mechanics, and the Limits of Scientific Objectivism
John B. DeBrota, Christian List
Consciousness and quantum mechanics are among the most puzzling phenomena studied in the sciences. Some scholars suggest they are related, though others think this claim commits a…
A Heptalemma for Quantum Mechanics
John B. DeBrota, Christian List
We present a seven-pronged no-go result for quantum mechanics: a "heptalemma". It shows that seven initially plausible theses about physical reality are jointly inconsistent with t…
Quantum Dynamics Happens Only on Paper: QBism's Account of Decoherence
John B. DeBrota, Christopher A. Fuchs, Ruediger Schack
QBism has long recognized quantum states, POVM elements, Kraus operators, and even unitary operations to be cut from the same cloth: They express aspects of an agent's belief syste…